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https://issues.apache.org/jira/browse/BEAM-2477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jingsong Lee closed BEAM-2477.
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> BeamAggregationRel should use Combine.perKey instead of GroupByKey
> ------------------------------------------------------------------
>
> Key: BEAM-2477
> URL: https://issues.apache.org/jira/browse/BEAM-2477
> Project: Beam
> Issue Type: Improvement
> Components: dsl-sql
> Reporter: Jingsong Lee
> Assignee: Jingsong Lee
> Labels: dsl_sql_merge
> Fix For: Not applicable
>
>
> Their semantics are the same, but the efficiency of implementation is quite
> different, and at the runner level there is a lot of optimization for
> `Combine.perKey`.
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